pls help thanks!

Helpful Hardware sells windows (80% of sales) and doors (20% of sales). The selling price of each window is $640 and of each door is $1.240. The variable cost of each window is 5430 and of each door is $940. Fixed costs are $1837,680. The weighted average contribution margin is: Multiple Choice o $510 O 5292 O $102 $378 Multiple Choice $510 $282 O $192 O $378 $228 O